Surveys in the US and Europe show that blue is the colour most commonly associated with harmony, faithfulness, confidence, distance, infinity, the imagination, cold, and sometimes with sadness.  In US and European public opinion polls it is the most popular colour, chosen by almost half of both men and women as their favourite colour.  The same surveys also showed that blue was the colour most associated with the masculine, just ahead of black, and was also the colour most associated with intelligence, knowledge, calm and concentration. 
Realglow pure blue color luminous pigment are based on Strontium Silicate, they could glow more than 12 hours. We could offer phosphorescent pigments from 10um to 150um (particle size), this color photoluminescent pigments are widely used for plastic and paint.